JP7313109B2 - electric lawn mower - Google Patents

Description

The present invention relates to an electric lawn mower including a battery that outputs high-voltage DC power, a plurality of electric motors, and a plurality of inverters that convert the DC power from the battery into AC power and supply the electric motor with the AC power.

In recent years, electric mowing machines include 5V analog sensors with low compatible voltage and 12V electronic control units and switches in order to reduce power consumption by increasing the voltage and reducing supply current, and for example, in order to reduce power consumption, and for example. It is considered that a battery that outputs high -voltage DC power such as V, a multiple electric motor, a plurality of inverters, and a high -voltage electrical components such as a converter for antihypertensive.

In such an electric lawn mower, in addition to low-voltage electrical components such as a control device and left and right rotation sensors, high-voltage electrical components include a battery that outputs high-voltage DC power (36V or higher), left and right traction electric motors that drive the left and right rear wheels, three cutting blade motors that rotate and drive three cutting blades, two driving inverters (motor controllers) that convert DC power from the battery into AC power and supply it to each driving motor, and DC power from the battery to AC power for each cutting blade. Some have a cutting blade inverter (motor controller) that supplies power to the blade electric motor, and a DC/DC converter that converts high-voltage power (36 V or higher) from a battery into low-voltage power (12 V) (see Patent Document 1, for example).

Japanese Unexamined Patent Application Publication No. 2013-1228

In the above-described electric lawn mower, high-voltage electrical components such as two inverters for traveling, an inverter for cutting blades, and a DC/DC converter are individually dispersed and assembled to the vehicle body. Therefore, there is room for improvement in improving the ease of assembly of high-voltage electrical components. In addition, since it is necessary to individually perform electric shock countermeasures, dustproof treatment, waterproof treatment, etc. for each high voltage electrical equipment that receives high voltage and large current flows, there is room for improvement in terms of reducing the work man-hours and costs required for electric shock countermeasures.

In other words, it is desired to reduce the number of man-hours and costs required for countermeasures against electric shocks for each high-voltage electrical component while improving the ease of assembly of the high-voltage electrical component.

As means for solving the above problems, an electric lawn mower according to the present invention includes:
a mower unit disposed at an intermediate portion in the longitudinal direction between the front wheels and the rear wheels below a traveling vehicle body having a vehicle body frame supported by the front wheels and the rear wheels;
A driver's seat is provided on the vehicle body frame in front of the rotation axis of the rear wheels, and a battery is provided rearward of the driver's seat and rearward of the rotation axis of the rear wheels,
Left and right running electric motors for driving the left and right rear wheels on the running vehicle body;
an electric motor for working that drives the mower unit;
a plurality of inverters that convert DC power from the battery into AC power and supply the power to an electric motor;
a storage box for housing a plurality of high-voltage electrical components with high corresponding voltages, including at least two of the inverters;
The working electric motor is supported on the rear portion of the housing of the mower unit,
As the inverters, left and right running inverters that supply converted AC power to the left and right running electric motors, and a working inverter that supplies converted AC power to the working electric motors are accommodated in the storage box,
The left and right running inverters are arranged side by side in front of the storage box in the longitudinal direction of the vehicle body, and the working inverters are arranged behind the left and right running inverters in the storage box,
the storage box is configured such that a bottom plate of a wall surface forming member that supports the inverter functions as a heat sink;
The storage box has a storage case that is open at the top and is connected to a support portion for the storage case on the vehicle body frame, a storage cover that is detachably attached to the upper part of the storage case, and a packing that seals between the storage case and the storage cover,
The storage case is formed with a plurality of outlets for pulling out a plurality of cables including the cable connected to the running inverter and the cable connected to the working inverter, and a grommet is attached to the place where the outlet is formed to protect the cable,
The storage box is located forward in the battery, located at the bottom of the driving seat, and has an interval between the upper and lower direction between the upper surface of the moral unit, and the upper and lower direction between the left and right driving electric motors, and the storage box is visual view of the previous view. By placing it in a position that overlaps with the electric motor for writing and the right and right driving electric motor, the storage box is located near the battery, the working electric motor, and the right and right driving motor.
A bottom plate of the storage box is arranged at a position lower than an upper edge of the vehicle body frame.

According to this means, it is possible to modularize a plurality of high-voltage electrical components, including two inverters, which are compatible with high voltages. As a result, these high-voltage electrical components can be easily attached to and detached from the vehicle body by attaching and detaching the storage box to and from the vehicle body. As a result, compared to the case where each high-voltage electrical component is individually attached to and detached from the vehicle body, attachment and detachment of each high-voltage electrical component to and from the vehicle body becomes easier, and the ease of assembly and maintenance of each high-voltage electrical component is improved.
In addition, electric shock countermeasures, dustproofing, waterproofing, etc. for a plurality of high-voltage electrical components including two inverters housed in the storage box can be collectively carried out by the storage box, so there is no need to perform them individually. As a result, it is possible to reduce the man-hours and costs required for countermeasures against electric shocks for each high-voltage electrical component.

Further, according to this means, the heat generated from each inverter can be quickly radiated from the wall surface forming member to the outside of the storage box.
As a result, it is possible to suppress the temperature rise in the storage box due to the heat generated by each inverter.

Furthermore, according to this means, it is possible to modularize a plurality of high-voltage electrical components with high corresponding voltages, including two drive inverters, and improve the ease of assembly and maintenance of each of the high-voltage electrical components, including the two drive inverters.
In addition, it is possible to reduce the number of man-hours and costs required for countermeasures against electric shocks for a plurality of high-voltage electrical components including two running inverters.

According to this means, it is possible to modularize a plurality of high-voltage electrical components with high corresponding voltages, including a running inverter and a working inverter, and improve the ease of assembly and maintenance of each high-voltage electrical component including two running inverters.
In addition, it is possible to reduce the number of man-hours and costs required for countermeasures against electric shocks for a plurality of high-voltage electrical components including inverters for running and inverters for work.

According to this measure, the length of the high voltage cable from the plurality of high voltage electrical components housed in the storage box to the battery or the electric motor is shortened.
As a result, reduction in power loss and cost reduction can be achieved.

Fig. 3 is a left side view of the electric lawn mower provided with the storage box; 1 is a plan view of an electric lawn mower with a storage box; FIG. It is an electric circuit diagram of the electric lawn mower. FIG. 4 is a cross-sectional plan view of a main part showing the arrangement of high-voltage electrical components housed in the housing box; It is a left view of the electric tractor provided with the storage box illustrated as a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is mounted on an electric lawn mower will be described below with reference to the drawings as an example of a mode for carrying out the present invention.
1 is the front side of the electric lawn mower, and the direction indicated by the arrow U is the upper side of the electric lawn mower.
2 is the front side of the electric lawn mower, and the direction indicated by the arrow R is the right side of the electric lawn mower.

As shown in FIGS. 1 and 2, the electric lawn mower exemplified in this embodiment includes a riding-type traveling vehicle body 1, and a mower unit (an example of a working device) 2 that is vertically and vertically suspended from the front and rear intermediate lower portions of the traveling vehicle body 1, and the like.

As shown in FIGS. 1 to 3, the traveling vehicle body 1 includes a vehicle body frame 3 forming a framework of the traveling vehicle body 1, left and right caster-type front wheels (an example of a traveling device) 4, left and right rear wheels (an example of a traveling device) driven so as to be capable of being independently speed-changed 5, a ride-on driving section 6 arranged on the front side of the traveling vehicle body 1, a battery housing section 7 arranged on the rear side of the traveling vehicle body 1, a rechargeable battery 8 housed in the battery housing section 7, and left and right traveling motors (electrical components) for driving the left and right rear wheels 5. 9, left and right gear-type speed reducers 10 that reduce power from the left and right running motors 9 and transmit it to the left and right rear wheels 5, left and right electromagnetic brakes (an example of electrical equipment) 11 that brake the left and right rear wheels 5, an electronic control unit (hereinafter referred to as an ECU) 12 that controls the operation of the left and right running motors 9, etc., and a parallel link type link mechanism 13 that supports the mower unit 2 by suspending it so that it can move up and down.

The mower unit 2 is arranged between the left and right front wheels 4 and the left and right rear wheels 5 . The mower unit 2 includes a plurality of blades 14 that are rotationally driven, a housing 15 that covers each blade 14 from above, a work motor (an example of an electrical component) 16 supported at the rear of the housing 15, a belt-type transmission (not shown) that transmits power from the work motor 16 to each blade 14, and a transmission cover 17 that covers the work motor 16 and the belt-type transmission.

As shown in FIGS. 1 and 2, the body frame 3 includes an arch-shaped protective frame 18 and the like. The left and right front wheels 4 are supported by the vehicle body frame 3 so as to change their directions. The left and right rear wheels 5 are supported by the body frame 3 via left and right gear-type reduction gears 10 and the like.

As shown in FIGS. 1 to 3, the driving unit 6 includes a driver's seat 19 supported in the front-rear intermediate portion of the vehicle body frame 3, left and right shift levers 20 arranged on both left and right sides of the driver's seat 19, a lift pedal 21 arranged at the foot of the driving unit 6, a key-operated main switch (an example of an electric component) 22 for turning on and off electrical components including the ECU 12 from the battery 8, and a charging switch (an example of an electrical component) for instructing the ECU 12 to start charging the battery 8. ) 23, etc.

Although not shown, the left and right shift levers 20 are of a rocking operation type, and their operation positions are input to the ECU 12 via left and right lever sensors (an example of electrical equipment). The ECU 12 performs travel control to control the outputs of the left and right travel motors 9 based on the inputs from the left and right lever sensors. With this travel control, the operator swings the left and right gear levers 20 to change the traveling state of the traveling vehicle body 1 by rotating the left and right rear wheels 5 forward and forward at a constant speed, forward turning and driving the left and right rear wheels 5 at different speeds, backward turning and driving the left and right rear wheels 5 in reverse at a constant speed, reverse turning and driving the left and right rear wheels 5 in reverse at different speeds, and driving one of the left and right rear wheels 5 in a forward or reverse direction. It is possible to switch between a pivot turning state in which it is driven and a spin turning state in which the left and right rear wheels 5 are rotationally driven in different directions.

In other words, this electric lawn mower is a so-called zero-turn mower that can be switched from a forward/backward straight running state to various turning states including a left/right spin turning state as a running state by operating the left and right shift levers 20.

As shown in FIG. 1, the lift pedal 21 is linked to the link mechanism 13. As shown in FIG. With this linkage, the operator can lift the mower unit 2 to the upper retracted position by depressing the lift pedal 21 . In addition, the operator can lower the mower unit 2 to the lower working position by canceling the stepping operation of the lift pedal 21 .

As shown in FIGS. 2 and 3, the main switch 22 is configured to be operable in three positions: an "OFF" position for cutting off power supply from the battery 8 to each electrical component, an "ON" position for powering the ECU 12 and the like to start the ECU 12, and a "START" position for commanding the ECU 12 to power the motors 9 and 16. The charging switch 23 is a momentary switch that returns to a cutoff state in which the electric current from the battery 8 to the ECU 12 is cut off.

Although not shown, the battery 8 is a battery pack in which a plurality of battery modules connected to output high-voltage (eg, 48 V) DC power, a controller that monitors the voltage and temperature of each battery module and controls the output, sensors such as an ammeter and a thermistor, and the like are housed in a battery case. The ECU 12 is composed of a microcomputer including a CPU, an EEPROM, and the like. The left and right traveling motors 9 and working motors 16 are AC motors (an example of electric motors) that operate with high-voltage (for example, 48V) three-phase AC power.

As shown in FIG. 3, the battery 8 is charged with power supplied from an external power supply 24, which is a commercial power supply, via a charger 25, a high voltage cable 26 for charging, and the like.

Although not shown, the charger 25 includes an AC-DC converter, a DC-DC converter, and an information management unit that acquires and manages information on charging. As a result, the charger 25 converts the AC power from the external power supply 24 into high voltage (for example, 48 V) DC power according to the specifications of the battery 8 and supplies the DC power to the battery 8 .

As shown in FIG. 3, the information management unit of the charger 25 is connected to the ECU 12, the controller of the battery 8, and the like via a communication line 27 and the like. This connection enables the information management unit to perform in-vehicle communication with the controller of the ECU 12 and the battery 8 by CAN (Controller Area Network) or the like. The high voltage cable 26 and communication line 27 are connected to the battery 8 via a first connector 28 and to the charger 25 via a second connector 29 .

As shown in FIG. 3, the electric circuit 30 of this tractor includes a first energizing path 31 that energizes each of the first low-voltage electrical components A1 of the 5V system with a low compatible voltage via a low-voltage cable 31A for 5V, a second energizing path 32 that energizes each of the second low-voltage electrical components A2 of the 12V system with a low compatible voltage via a low-voltage cable 32A for 12V, and each high-voltage electrical component A3 of the 48V system with a high compatible voltage. A third energization path 33 that conducts electricity via a high voltage cable 33A for 48V and a conductive bar 33B is provided.

Each first low-voltage electrical component A1 includes various analog sensors 34 such as rotary potentiometers used for the left and right lever sensors, encoders (not shown) provided for each motor 9 and 16, and the like. Each of the second low-voltage electrical components A2 includes the ECU 12, a vehicle speed display meter 35, various command switches 36 such as a PTO switch for commanding the ECU 12 to intermittently energize the work motor 16, a headlight 37 made up of a plurality of LEDs, a headlight switch 38, a reverse alarm buzzer 39, and various low-voltage fuses 40.
Each high-voltage electrical component A3 includes a battery 8, left and right driving motors 9, left and right electromagnetic brakes 11, a working motor 16, a main switch 22, a charging switch 23, two driving inverters 41, one working inverter 42, a step-down converter 43, a main relay 44 for intermittently energizing the third energization path 33, an inverter relay 45 for intermitting energizing to each of the inverters 41 and 42, and a hold that enables energizing to the ECU 12 bypassing the main switch 22. Relays 46 and various fuses 47 for high voltage, and so on.

As shown in FIGS. 1 to 4, the traveling vehicle body 1 has a storage box 50 that is detachable from the vehicle body. Among the high-voltage electrical components A3 described above, each running inverter 41, working inverter 42, converter 43, main relay 44, inverter relay 45, holding relay 46, and various fuses 47 are housed in the storage box 50.
According to this configuration, a plurality of high-voltage electrical components A3 such as two running inverters 41, a working inverter 42, and a converter 43 can be modularized. As a result, these high-voltage electrical components A3 can be easily attached to and detached from the vehicle body by attaching and detaching the storage box 50 to and from the vehicle body. As a result, compared to the case where each high-voltage electrical component A3 is individually attached to and detached from the vehicle body, attachment and detachment of each high-voltage electrical component A3 to and from the vehicle body is simplified, and the assembling and maintenance of each high-voltage electrical component A3 is improved.
In addition, since electric shock countermeasures, dustproofing, waterproofing, etc. for the high-voltage electrical components A3 housed in the housing box 50 can be collectively performed by the housing box 50, there is no need to perform these individually. As a result, it is possible to reduce the man-hours and costs required for countermeasures against electric shocks for each of the high-voltage electrical components A3.
In addition to housing the high-voltage electrical components A3 in the storage box 50, the connection of the high-voltage cables 33A to the respective high-voltage electrical components A3 in the storage box and the connection of the high-voltage electrical components in the storage box by the conductive bars 33B can be performed in the storage box, so that the exposure of the high-voltage electrical components A3, the high-voltage cables 33A, and the conductive bars 33B to which a high voltage is applied and a large current flows is reduced. As a result, it is possible to suitably avoid the risk of electric shock due to contact with the high-voltage electrical component A3, the high-voltage cable 33A, and the like.
Moreover, since a plurality of high-voltage electrical components A3 and the like are concentrated and compactly arranged in the storage box, space can be saved compared to the case where each high-voltage electrical component A3 and the like is individually assembled to the vehicle body. Further, the length of the conductive bar 33B that connects the high-voltage electrical components in the storage box is shortened, so that power loss and cost can be reduced. In addition, since the high voltage cable 33A is separated from the other low voltage cables 31A and 32A, it becomes easier to inspect the high voltage cable 33A.

As shown in FIGS. 1 to 2 and 4, the storage box 50 includes a storage case 51 with an open top, a storage cover 52 detachably attached to the top of the storage case 51, and the like. A bottom plate 51A and a front plate 51B of the storage case 51 are formed with a plurality of outlets (not shown) for drawing out the high-voltage cables 33A. A grommet 53 for protecting the high-voltage cable 33A is attached to the bottom plate 51A and the front plate 51B where the outlet is formed.

The storage case 51 includes a plurality of connecting portions 51C that are bolted to the storage case support portion 3A of the vehicle body frame 3 .
As a result, the storage box 50 can be easily attached to and detached from the vehicle body by connecting or disconnecting the connecting portions 51C to the supporting portion 3A of the vehicle body frame 3 with bolts.

As shown in FIGS. 1 and 2, the storage box 50 is arranged near the battery 8, the left and right travel motors 9, and the work motor 16. As shown in FIGS.
As a result, the length of the high voltage cable 33A extending from the plurality of high voltage electrical components A3 housed in the housing box 50 to the battery 8 or the motors 9 and 16 is shortened.
As a result, reduction in power loss and cost reduction can be achieved.

In the storage box 50 , a bottom plate (an example of a wall forming member) 51 A that supports the inverters 41 and 42 and the converter 43 functions as a heat sink 54 .
As a result, the heat generated from the inverters 41 and 42, the converter 43, and the like can be quickly dissipated from the bottom plate 51A to the outside of the storage box.
As a result, it is possible to suppress the temperature rise in the storage box due to the heat generated by the inverters 41, 42 and the converter 43.

The storage box 50 has a packing (not shown) that seals the gap between the storage case 51 and the storage cover 52 .
As a result, the storage box 50 is highly dustproof and waterproof, and the high-voltage electrical components A3 and the conductive bars 33B in the storage box can be protected from dust, rainwater, and the like.
As a result, it is possible to reduce the cost by adopting the high-voltage electrical component A3 with low dustproofness and waterproofness.

As shown in FIGS. 1-2, a storage box 50 is positioned near the battery 8 and each motor 9,16.
As a result, the length of each high voltage cable 33A extending between each high voltage electrical component A3 in the storage box and the battery 8 or each motor 9, 16 can be shortened.
As a result, the voltage drop can be reduced and the cost can be reduced.
[Comparative example]
Although not an embodiment of the present invention, a lawn tractor as shown in FIG. 5, for example, is also conceivable as an electric lawn mower.
In such a loan tractor, a ride-on driving unit 6 is arranged on the rear side of the traveling vehicle body 1, and a battery storage unit 7 for storing a rechargeable battery 8 is arranged on the front side of the traveling vehicle body 1. Front and rear driving motors (electric motors) 9 that drive the left and right rear wheels 5 and a storage box 50 that houses a plurality of high-voltage electrical components A3 are arranged below the driver's seat 19 in the driving unit 6.
In this structure, since the conductive distance of the high-voltage cable from the battery 8 to the storage box 50 is long, compared to the structure shown in the above embodiment, there is a disadvantage in that the number of man-hours required for countermeasures against electric shocks and the cost are likely to increase.

[Another embodiment]
The present invention is not limited to the configurations exemplified in the above embodiments, and hereinafter, other representative embodiments relating to the present invention will be exemplified.

[1] The configuration of the electric lawn mower can be modified in various ways.
For example, the electric lawn mower may be configured to have a semi-crawler specification including left and right front wheels 4 and left and right crawlers as a traveling device.
For example, the electric lawn mower may be configured with full crawler specifications including left and right crawlers as a traveling device.
For example, the electric lawn mower may have a hybrid specification that includes an engine and electric motors 9 and 16 .
For example, the electric lawn mower may be configured to include a plurality of traveling motors 9 without including the working motor 16 . As the plurality of driving motors 9, four driving motors 9 for individually driving the left and right front wheels 4 and the left and right rear wheels 5, two driving motors 9 for driving the left and right front wheels 4 and rear wheel driving for driving the left and right rear wheels 5, or two driving motors 9 for individually driving the left and right front wheels 4 or the left and right rear wheels 5 can be considered.
For example, the electric lawn mower may be configured to include a plurality of working motors 16 . As the plurality of work motors 16, a plurality of work motors 16 that individually drive a plurality of work devices connected to the vehicle body, a plurality of work motors 16 that individually drive a plurality of blades 14 provided in the mower unit 2, or the like can be considered.
For example, the electric lawn mower may be configured to include, as the electric motors 9 and 16, electric motors for supplying hydraulic pressure that drive hydraulic pumps provided in the vehicle body.
For example, the electric lawn mower may be configured to include a plurality of batteries 8 that output high-voltage DC power.
For example, the electric lawn mower may be configured to include a battery 8 that outputs high-voltage DC power and a battery that outputs low-voltage DC power.

[2] The electric motors 9 and 16 may be motor generators functioning as generators. Also, the electric motors 9 and 16 may be brushless DC motors instead of AC motors.

[3] In addition to the inverter 41 for running and the inverter 42 for work, the inverter may be, for example, a hydraulic pressure supply inverter that supplies converted AC power to the hydraulic pressure supply electric motor described above.

[4] The plurality of high-voltage electrical components A3 housed in the housing box 50 can be modified in various ways.
For example, the plurality of high-voltage electrical components A3 stored in the storage box 50 may be only two inverters 41 for running.
For example, the plurality of high-voltage electrical components A3 housed in the housing box 50 may be only two inverters 42 for work.
For example, the plurality of high-voltage electrical components A3 stored in the storage box 50 may be only two, one running inverter 41 and one working inverter 42 .
For example, the plurality of high-voltage electrical components A3 stored in the storage box 50 may be any one of the hydraulic pressure supply inverter described above and at least the travel inverter 41 and the work inverter 42 .
For example, the storage box 50 may include a storage box 50 for travel and a storage box 50 for work, the storage box 50 for travel may store a plurality of high-voltage electrical components A3 including at least two inverters 41 for travel, and the storage box 50 for work may store a plurality of high-voltage electrical components A3 including at least two inverters 42 for work.
For example, in an electric lawn mower including a boost converter as the high-voltage electrical component A3, the boost converter may be accommodated in storage box 50 together with at least two inverters 41 and 42 .

[5] The configuration of the storage box 50 can be changed in various ways.
For example, the storage box 50 may have a structure in which any one of the front plate 51B, the rear plate, the right side plate, the left side plate, and the top plate other than the bottom plate 51A supports the plurality of inverters 41 and 42, and the wall surface forming member supporting the plurality of inverters 41 and 42 functions as the heat sink 54.
For example, the storage box 50 may be configured such that the plurality of inverters 41 and 42 are supported by a plurality of wall surface forming members selected from a front plate 51B including a bottom plate 51A, a rear plate, a right side plate, a left side plate, and a top plate, and the plurality of wall surface forming members supporting the plurality of inverters 41 and 42 function as heat sinks 54.
For example, the storage box 50 may have a configuration in which the wall surface forming member that supports the inverters 41 and 42 does not function as the heat sink 54 .
For example, the storage box 50 may be configured such that a plurality of outlets for drawing out the high-voltage cables 33A are provided with connectors, and the high-voltage cables 33A inside the storage box and the high-voltage cables 33A outside the storage box are connected by the connectors.

[6] The corresponding voltage of each high-voltage electrical component A3 may be a voltage (for example, 36V) other than 48V illustrated in the above embodiment as long as it is a high voltage of 36V or higher.

INDUSTRIAL APPLICABILITY The present invention can be applied to various types of electric lawn mowers, such as a multi-purpose electric lawn mower and a lawn mower equipped with a battery that outputs high-voltage DC power, a plurality of electric motors, and a plurality of inverters that convert the DC power from the battery into AC power and supply the AC power to the electric motor.

2 Mower unit (working device)
4 front wheel (running device)
5 rear wheel (running device)
8 Battery (high voltage electrical equipment)
9 Running motor (electric motor, high voltage electrical equipment)
16 work motor (electric motor, high voltage electrical equipment)
41 Inverter for driving (inverter, high voltage electrical equipment)
42 Inverter for work (inverter, high voltage electrical equipment)
50 storage box 51A bottom plate (wall surface forming member)
54 Heat sink A3 High voltage electrical equipment

Claims (1)

a mower unit disposed at an intermediate portion in the longitudinal direction between the front wheels and the rear wheels below a traveling vehicle body having a vehicle body frame supported by the front wheels and the rear wheels;
A driver's seat is provided on the vehicle body frame in front of the rotation axis of the rear wheels, and a battery is provided rearward of the driver's seat and rearward of the rotation axis of the rear wheels,
Left and right running electric motors for driving the left and right rear wheels on the running vehicle body;
an electric motor for working that drives the mower unit;
a plurality of inverters that convert DC power from the battery into AC power and supply the power to an electric motor;
a storage box for housing a plurality of high-voltage electrical components with high corresponding voltages, including at least two of the inverters;
the working electric motor is supported on the rear part of the housing of the mower unit;
As the inverters, left and right running inverters that supply converted AC power to the left and right running electric motors, and a working inverter that supplies converted AC power to the working electric motors are accommodated in the storage box,
The left and right running inverters are arranged side by side in front of the storage box in the longitudinal direction of the vehicle body, and the working inverters are arranged behind the left and right running inverters in the storage box,
the storage box is configured such that a bottom plate of a wall surface forming member that supports the inverter functions as a heat sink;
The storage box has a storage case that is open at the top and is connected to a support portion for the storage case on the vehicle body frame, a storage cover that is detachably attached to the upper part of the storage case, and a packing that seals between the storage case and the storage cover,
The storage case is formed with a plurality of outlets for pulling out a plurality of cables including the cable connected to the running inverter and the cable connected to the working inverter, and a grommet is attached to the place where the outlet is formed to protect the cable,
The storage box is located forward in the battery, located at the bottom of the driving seat, and has an interval between the upper and lower direction between the upper surface of the moral unit, and the upper and lower direction between the left and right driving electric motors, and the storage box is visual view of the previous view. By placing it in a position that overlaps with the electric motor for writing and the right and right driving electric motor, the storage box is located near the battery, the working electric motor, and the right and right driving motor.
An electric lawn mower, wherein a bottom plate of the storage box is arranged at a position lower than an upper edge of the vehicle body frame.

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